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It's the little tricks that make life easier - if you remember them 
Here a trick to determine if a number is even or odd by determining what the modulus (left over after division) when we divide a number by 2 - Even numbers can be dividied by 2 and will result in a modulus (left over) of zero, odd numbers however will result in a modulus of 1:
<!--?php
<?php
// example nummer
$number = 25;
// with modulus (%) we determine if a number is odd or even
if( $odd = $number%2 )
{
// $odd == 1; left over or modulus of 1 indicates an ODD number
echo 'Odd number!';
}
else
{
// $odd == 0; left over or modulus of zero indicate an EVEN number
echo 'Even number!';
}
?>
